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content="Lizikang_Blog"></span><header class="post-header"><h1 class="post-title" itemprop="name headline">信息安全实验三、网络监听</h1><div class="post-meta"><div class="post-time" style="display:inline-block"><span class="post-meta-item-icon"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-calendar-line"></use></svg></span> <time title="创建时间：2021-05-21 00:00:00" itemprop="dateCreated datePublished" datetime="2021-05-21T00:00:00+08:00">2021-05-21</time><span class="post-meta-divider">-</span><span class="post-meta-item-icon"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-calendar-2-line"></use></svg></span> <time title="修改时间：2021-05-26 14:40:51" itemprop="dateModified" datetime="2021-05-26T14:40:51+08:00">2021-05-26</time></div><span class="post-busuanzi"><span class="post-meta-divider">-</span><span class="post-meta-item-icon" title="阅读次数"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-eye-line"></use></svg> <span id="busuanzi_value_page_pv"></span></span></span><div class="post-classify"><span class="post-category"><span class="post-meta-item-icon"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-folder-line"></use></svg></span> <span itemprop="about" itemscope itemtype="https://schema.org/Thing"><a class="category" href="/categories/%E4%BF%A1%E6%81%AF%E5%AE%89%E5%85%A8/" style="--text-color:var(--hty-text-color)" itemprop="url" rel="index"><span itemprop="text">信息安全</span></a></span> > <span itemprop="about" itemscope itemtype="https://schema.org/Thing"><a class="category" href="/categories/%E4%BF%A1%E6%81%AF%E5%AE%89%E5%85%A8/%E5%AE%9E%E9%AA%8C/" style="--text-color:var(--hty-text-color)" itemprop="url" rel="index"><span itemprop="text">实验</span></a></span></span><span class="post-tag"><span class="post-meta-divider">-</span><a class="tag" href="/tags/%E4%BF%A1%E6%81%AF%E5%AE%89%E5%85%A8/" style="--text-color:var(--hty-text-color)"><span class="post-meta-item-icon"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-price-tag-3-line"></use></svg></span><span class="tag-name">信息安全</span></a></span></div></div></header><section class="post-body" itemprop="articleBody"><div class="post-content markdown-body" style="--smc-primary:black;"><h2 id="实验三、网络监听"><a href="#实验三、网络监听" class="headerlink" title="实验三、网络监听"></a>实验三、网络监听</h2><h3 id="一、实验目的及要求"><a href="#一、实验目的及要求" class="headerlink" title="一、实验目的及要求"></a>一、实验目的及要求</h3><p>1．熟悉网络监听工具ethereal操作界面；</p>
<p>2．了解ethereal捕获与监听网络数据方法；</p>
<p>3．强化网络安全意识。</p>
<h3 id="二、实验学时"><a href="#二、实验学时" class="headerlink" title="二、实验学时"></a>二、实验学时</h3><p>2学时</p>
<h3 id="三、实验任务"><a href="#三、实验任务" class="headerlink" title="三、实验任务"></a>三、实验任务</h3><p>利用网络监听工具捕获和监听数据报</p>
<p>四、实验重点、难点</p>
<p>网络监听工具ethereal的操作界面和熟练使用</p>
<h3 id="五、操作要点"><a href="#五、操作要点" class="headerlink" title="五、操作要点"></a>五、操作要点</h3><p>1.安装ethereal</p>
<p>2.熟悉软件操作界面</p>
<h3 id="六、注意事项"><a href="#六、注意事项" class="headerlink" title="六、注意事项"></a>六、注意事项</h3><p>实验之前，各台计算机之间用交换机连接，构成一个内部局域网。</p>
<h3 id="七、实验过程："><a href="#七、实验过程：" class="headerlink" title="七、实验过程："></a>七、实验过程：</h3><p><strong>（1）ethereal的安装与配置</strong></p>
<p><strong>ethereal</strong>的安装过程：</p>
<p><img src="https://gitee.com/li_zikang/lzk-image/raw/master/img/wps1-1621589326207.jpg" alt="img" loading="lazy"> </p>
<p><img src="https://gitee.com/li_zikang/lzk-image/raw/master/img/wps2-1621589326207.jpg" alt="img" loading="lazy"> </p>
<p><img src="https://gitee.com/li_zikang/lzk-image/raw/master/img/wps3-1621589326208.jpg" alt="img" loading="lazy"> </p>
<p><img src="https://gitee.com/li_zikang/lzk-image/raw/master/img/wps4-1621589326208.jpg" alt="img" loading="lazy"> </p>
<p><img src="https://gitee.com/li_zikang/lzk-image/raw/master/img/wps5-1621589326208.jpg" alt="img" loading="lazy"> </p>
<p><img src="https://gitee.com/li_zikang/lzk-image/raw/master/img/wps6-1621589326208.jpg" alt="img" loading="lazy"> </p>
<p><img src="https://gitee.com/li_zikang/lzk-image/raw/master/img/wps7-1621589326208.jpg" alt="img" loading="lazy"> </p>
<p><img src="https://gitee.com/li_zikang/lzk-image/raw/master/img/wps8-1621589326208.jpg" alt="img" loading="lazy"> </p>
<p><img src="https://gitee.com/li_zikang/lzk-image/raw/master/img/wps9-1621589326208.jpg" alt="img" loading="lazy"> </p>
<p><img src="https://gitee.com/li_zikang/lzk-image/raw/master/img/wps10-1621589326208.jpg" alt="img" loading="lazy"> </p>
<p><img src="https://gitee.com/li_zikang/lzk-image/raw/master/img/wps11-1621589326209.jpg" alt="img" loading="lazy"> </p>
<p><img src="https://gitee.com/li_zikang/lzk-image/raw/master/img/wps12-1621589326209.jpg" alt="img" loading="lazy"> </p>
<p><strong>ethereal的使用说明（以对百度网站进行三次握手为例）：</strong></p>
<p><em>ping <a href="http://www.baidu.com" target="_blank" rel="noopener">www.baidu.com</a></em></p>
<p><img src="https://gitee.com/li_zikang/lzk-image/raw/master/img/wps13-1621589326209.jpg" alt="img" loading="lazy"> </p>
<p><em>ip.dst ==14.215.177.38</em></p>
<p><img src="https://gitee.com/li_zikang/lzk-image/raw/master/img/wps14-1621589326209.jpg" alt="img" loading="lazy"> </p>
<p><img src="https://gitee.com/li_zikang/lzk-image/raw/master/img/wps15-1621589326209.jpg" alt="img" loading="lazy"> </p>
<p>3.</p>
<p><img src="https://gitee.com/li_zikang/lzk-image/raw/master/img/wps16-1621589326209.jpg" alt="img" loading="lazy"> </p>
<p><img src="https://gitee.com/li_zikang/lzk-image/raw/master/img/wps17-1621589326235.jpg" alt="img" loading="lazy"> </p>
<p><strong>（2）Ping数据包分析</strong></p>
<p>打开ethereal的捕获功能，找到局域网所在网关的ip地址，然后ping下该ip。</p>
<p>捕获截图：</p>
<p>本机地址：</p>
<p><img src="https://gitee.com/li_zikang/lzk-image/raw/master/img/wps18-1621589326301.jpg" alt="img" loading="lazy"> </p>
<p><em>ping 172.16.36.254</em></p>
<p><img src="https://gitee.com/li_zikang/lzk-image/raw/master/img/wps19-1621589326315.jpg" alt="img" loading="lazy"> </p>
<p><em>ip.dst==172.16.36.254 or ip.src==172.16.36.254</em></p>
<p><img src="https://gitee.com/li_zikang/lzk-image/raw/master/img/wps20-1621589326315.jpg" alt="img" loading="lazy"> </p>
<p>结果分析：</p>
<p>Sequence number ：</p>
<p>0X000d</p>
<p><img src="https://gitee.com/li_zikang/lzk-image/raw/master/img/wps21-1621589326235.jpg" alt="img" loading="lazy"> </p>
<p><img src="https://gitee.com/li_zikang/lzk-image/raw/master/img/wps22-1621589326235.jpg" alt="img" loading="lazy"> </p>
<p><img src="https://gitee.com/li_zikang/lzk-image/raw/master/img/wps23.jpg" alt="img" loading="lazy"> </p>
<p>Sequence number ：</p>
<p>0X000e</p>
<p><img src="https://gitee.com/li_zikang/lzk-image/raw/master/img/wps24.jpg" alt="img" loading="lazy"> </p>
<p><img src="https://gitee.com/li_zikang/lzk-image/raw/master/img/wps25.jpg" alt="img" loading="lazy"> </p>
<p><img src="https://gitee.com/li_zikang/lzk-image/raw/master/img/wps26.jpg" alt="img" loading="lazy"> </p>
<p>Sequence number ：</p>
<p>0X000f</p>
<p><img src="https://gitee.com/li_zikang/lzk-image/raw/master/img/wps27.jpg" alt="img" loading="lazy"> </p>
<p><img src="https://gitee.com/li_zikang/lzk-image/raw/master/img/wps28.jpg" alt="img" loading="lazy"> </p>
<p><img src="https://gitee.com/li_zikang/lzk-image/raw/master/img/wps29.jpg" alt="img" loading="lazy"> </p>
<p>Sequence number ：</p>
<p>0X0010</p>
<p><img src="https://gitee.com/li_zikang/lzk-image/raw/master/img/wps30.jpg" alt="img" loading="lazy"> </p>
<p><img src="https://gitee.com/li_zikang/lzk-image/raw/master/img/wps31.jpg" alt="img" loading="lazy"> </p>
<p><img src="https://gitee.com/li_zikang/lzk-image/raw/master/img/wps32.jpg" alt="img" loading="lazy"> </p>
<p>（2）打开ethereal的捕获功能，找到校园网环境下某网址，比如学费查询的地址，输入用户名和密码，对输入的用户和密码进行嗅探。</p>
<p>捕获截图：</p>
<p> <img src="https://gitee.com/li_zikang/lzk-image/raw/master/img/image-20210521173236527.png" alt="image-20210521173236527" loading="lazy"></p>
<p>抓包捕获用户名和密码</p>
<h3 id="七、实验小结（100字左右）"><a href="#七、实验小结（100字左右）" class="headerlink" title="七、实验小结（100字左右）"></a>七、实验小结（100字左右）</h3><p>在本次实验中学会和熟悉了抓包工具（ethereal），虽然之前在网络原理课程初步了解了抓包和实验了，但本次实验是对信息安全的学习，对抓包和信息安全有了更加深刻的了解。实验的最后还进行了实践，抓取了用户名和密码，对信息安全有了更加深刻的体会，在今后我的项目开发中也会注意信息安全，防止信息泄露。本次实验受益匪浅，期待下一次实验。</p>
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